Originally Posted by
HarryCrumb
Martin, thank you for checking. The way you describe your wiring is different to how Barry describes in post 10. Or is that essentially the same thing? His description is how I would have thought best to do it - Red and Orange to Rectifier. Black and Yellow form centre tap to ground.
I've just spoken to Quad and double checked the price of a replacement transformer. It's not as much as I seemed to remember, coming in at £90 inc vat. The torodial that we are discussing comes in at £86 (plus a little to have a mounting plate made) so I'm currently mulling over my options. The torodial would be the better transformer in theory, but the original style may be a safer bet in terms of fit, and possible re-sale (though I have zero plans to sell my 405's).
I've got four 405's and really love them as amplifiers. They sound great with my speakers and are a joy to tinker with or work on. I would be interested to know if anyone has noticed an audible difference with a torodial?